SI9130DB vishay siliconix faxback 408-970-5600, request 70725 10-feb-97 www.siliconix.com 1 si9130 demonstration board features description the si9130 dual-output power-supply controller for notebook computers is a system level integration of two step- down controllers with micropower 5- and 3.3-v linear regulators. the controllers perform high efficiency conversion of the battery pack energy (typically 12 v) or the output of an ac-to-dc wall converter (typically 18 v to 24 v dc) to 5- and 3.3-v system supply voltages. the micropower linear regulator can be used to keep power management and back- up circuitry alive during the shutdown of the step-down converters. the 3.3-v output is adjustable to 3.3 v, 3.45 v or 3.6 v by programming control pins 3.45 adj and 3.6 adj. leaving both pins open results in 3.3-v nominal output. grounding pin 3.45 adj while leaving 3.6 adj open delivers 3.45-v nominal output. grounding pin 3.6 adj while leaving 3.45 adj open delivers 3.6-v nominal ouput. on the demo board, the si9130 is configured as a complete system, ready for operation. it takes 5.5- to 30-v in, and produces regulated 5 v at any current from no load to 3 a, and 3.3 v out at any current from no load to 3 a. included in this document are the bill of materials, demo board schematic, and pcb layout. the demonstration board layout is available in gerber file format. please contact your vishay sales representative or distributor for a copy. ordering information: part number SI9130DB power-up check listinstalled in vrm mother board socket 1. start by setting the control switches located in the bottom right corner of the demo board. set the top switch to the left, setting the switching frequency to 200 khz (to the right is 300 khz). set the second switch down to the right, turning the 5-v converter on (to the left is off). set the third switch down to the right, turning the 3.3-v converter on (to the left is off). set the bottom switch to the right, allowing the pwm to operate (to the left is shutdown). 2. attach an electronic load set in resistive mode to the 3.3-v output pins. set the current to 100 ma. alternatively, you can use a resistor of value 33 w , 1 w. 3. attach an electronic load set in resistive mode to the 5-v output pins. set the current to 100 ma. alternatively, you can use a resistor of value 50 w , 1 w. 4. attach a 10-v supply and ground to the pins on the top side of the board. it is best to use a separate wire from the supplys ground to each of the demo boards ground pins, because of the high currents at low input voltages. 5. take an oscilloscope probe, and place the ground on the 5-v gnd pin, and the probe on the 5-v pin. set the vertical scale for this channel at ac coupled at 50 mv/div. take a second probe, and place the ground on the 5-v gnd pin, and the probe on pin 17 (lx 5 ) of the si9130. set this channel at dc coupled 2 v/div. set the time base at 200 sec/div. 6. leave the probes in place. change the scale on the second probe (the one attached to pin 17) to 10 v/div, and the time base to 500 nsec/div. set the 5-v output current on the electronic load to 1 a. set the input power supply to 16 v. alternatively, first turn off the input power supply , and replace the 50-w resistor with a 5- w , 10-w resistor, and then turn the input power supply back on, setting it to 16 v. 7. this step should be performed only if an electronic load is being used. set the input voltage to 15 v. remove the second probe (the one attached to pin 17 of the si9130), or turn off the channel displaying it. place a current probe around the wire leading from the 5-v output to the electronic load, and set the oscilloscope and amplifier so that it will display approximately 2 a/div. set the oscilloscope time base back to 200 sec/div. set the 3.3-v electronic load to have a constant 1-a load. now set up the 5-v electronic load so that it cycles between 100 ma and 3 a at approximately 1 khz (1 msec period). 8. this step should be performed only if an electronic load is being used. set the 5-v electronic load back to a constant 1-a current. remove the voltage probe from the 5-v output. move the ground of the probe onto the gnd pin of the 3.3-v output, and the probe onto the 3.3-v output pin. remove the current probe from the 5-v output wire, and place it around the wire leading from the 3.3-v output to the electronic load. now set up the 3.3-v electronic load so that it cycles between 100 ma and 3 a at approximately 1 khz (1 msec period). ? 5- and 3.3-v step-down synchronous converters ? less than 500-a quiescent current ? 25-a shutdown current ? 5.5- to 30-v input operating range SI9130DB
SI9130DB vishay siliconix 10-feb-97 faxback 408-970-5600, request 70725 2 www.siliconix.com figure 1. top silkscreen figure 2. to p l aye r figure 3. bottom layer
SI9130DB vishay siliconix 10-feb-97 faxback 408-970-5600, request 70725 3 www.siliconix.com SI9130DB application circuit
SI9130DB vishay siliconix 10-feb-97 faxback 408-970-5600, request 70725 4 www.siliconix.com bill of material for si9130 dual-output power supply part used reference designators part type description/part number pattern manufacturer 1 1 u1 si9130 d-o pwr supply, si9130 ssop-28 vishay siliconix 2 2 l1, l2 10 h inductor, 10 h, crd125-100 cdr125-100 sumida 3 4 n1-n4 si9410dy n-channel mosfet, si9410dy so-8 vishay siliconix 4 1 sw1 spst sw-spst dip-4 multi-source 5 2 d1, d3 1n5819 diode, 1n5819 sod-87 nikon 6 1 cr2 cmpd2836 diode, cmpd2836 sot-23 central semiconductor 7 2 r1, r2 0.025 w , 1% resistor, lr2010-01-r025f 2010 irc 8 6 r3-r6 1 m w resistor, crcw0805105jrt1 0805 vishay dale 91 r9 1k w resistor, crcw0805102jrt1 0805 vishay dale 10 1 r10 open resistor, (open) 0805 multi-source 11 1 r11 100 w resistor, crcw0805101jrt1 0805 vishay dale 12 2 c1, c10 33 f, 35 v capacitor, tantalum, 595d336x0035sr r vishay sprague 13 1 c2 4.7 f, 6 v capacitor, ceramic, 1206yg475zat 1206 avx 14 2 c3 1 f, 20 v capacitor, tantalum, taja105m025 aavx 15 2 c4, c5 0.1 f, 16 v capacitor, vj0805y104kxxat 0805 vishay vitramon 16 1 c6, c7, c11, c12 330 f, 6 v capacitor, tantalum, tpse337m006r0100 eavx 17 2 c8, c9 0.01 f, 16 v capacitor, vj0805y103kxxat 0805 vishay vitramon 18 1 c13 0.1 f, 35 v capacitor, vj0805y104kxaat 0805 vishay vitramon
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